#app2 ol {
  list-style: none;
}
#app2 .tab_bar {
  display: flex;
  flex-direction: row;
}
#app2 .tab_bar li {
  border: 3px solid black;
  width: 50%;
}
#app2 .tab_bar li.selected {
  background-color: red;
}
#app2 .tab_con li {
  display: none;
}
#app2 .tab_con li.active {
  display: block;
}
